Gas-engine.



O. M. DB LAUNTY GAS ENGINE.

APPLICATION FILED JAN.16,1918.

Patented Jan. 19, 1915.

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GAS ENGINE.

APPLICATION FILED 51111.16 1913v Z 5 m2 1. w@ 9 .1 mm m 0. M. DB LAUNTY.

GAS ENGINE.

APPLICATION FILED JAN. 16. I913v gg gyg Patented Jan 19, 1915.

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UNITED srn rns PAEENT oFFroE.

OLIVER M. DE LAUNTY, OF CHICAGO, ILLINOIS, ASSIG-NOR T CHARLES H. 3' OFCHICAGO, ILLINOIS.

GAS-ENGINE.

Specification of Letters Patent.

Patented Jan. 19,1915.

Application filed January. 18, 1513. Serial No. 742,423.

0 all whom it may concern:

Be it known that I, OLIVER M. DE

' LAUNTY, a citizen of the United States, and

resident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Gas-Engines, of whichthe following is a specification, and which are illustrated in theaccompanying drawings, forming a part thereof.

The invention relates to gas engines, and more particularly to those ofthat type having cylinders bored to two diameters and operated in pairs,the smaller bore of each .cylinder being'connected with the larger boreof the other cylinder and the latter serving as a pump chamber forreceiving and compressing the explosive charge. Certain features of theinvention, however, are applicable to gas engines generally. and theobject of the invention is to provi-...e a engine which shall beeilicicnt in operation and of improved form in structural detail.

A feature of the inv tion provides an independent chamber in mediate thepump chamber and the power cylinder and serving to prevent theproduction of too great a pressure in the pump chamber, while stillpermitting such chamber to supply the ex plosive charge in the requiredquantity.

The invention is exemplified in the struc ture to be hereinafterdescribed, and which is illustrated. in the accompanying drawings,wherein Figure 1 is a side View of a gas engine embodying the featuresof improvement provided by the invention, some of the parts being shownin section and the planes of the section being indicated by the brokenline l1 on Fig. 2; Fig. .2 is a plan sectional view of the engine takenon the broken line 2-2 of Fig. 1; Fig. 3 is a detail plan sectional viewtaken on the line 3-3 of Fig. 1; Figs. 4 and 5 are detail perspectiveviews, partly in section, showing the construction of a check valve usedin the engine; and Figs. 6 and 7 are sectional views taken on the brokenlines 66 and 77, respectively, of Fig. 2.

The engine illustrated in the drawings comprises four cylinders. Theseare generally designated by the numerals 10, 11, 12 and 13. They arepreferably surrounded by a common water jacket 1%. As shown, the walls.of all of the cylinders 10, 11, 12 and. 13, and the side walls of the.water jacket let are cast integral in one piece. The water jacket H hasan oblong rectangular opening 15 at its top, and a continuousoutstanding foot flange 16.

The usual crank case 17 is provided below the cylinders. This crank caseprovides bearings 18, 19, for the crank shaft 20, and is made rigid withthe walls of the several cylinders, as by being secured to the footflange 16 by bolts 21. The top opening 15 of the water jacket 14 isnormally covered by a removable top plate The top plate is formed with anipple 23 adapted to serve as an outlet for water delivered to thechamber of the jacket M. This water is. preferably provided at the lowerpart of the chamber of the jacket, as through a duct 24 which leadsthrough an opening in the end wall of the jacket.

A piston, as 26. 2? and 28, operates in each of the cylinders 10, 11, 12and 13. These pistons are connected by pitinen, as to the several cranks30, 31, 32 and 33 respectively of the crank shaft 20. Preferably thecranks of the crank shaft 20 are so arranged that the twb pistons, as:25, 26, and 2?, 28, of the pair of cylinders adjacent each end of theengine act in alternation, and that one piston of each of such pairsacts inter.- mediate the two pistons of the other pair.

The corresponding cylinders of the two pairs and the pistons thereforare preferably of like construction. Each cylinder is shown as beingbored upon two diameters whereby it is provided with an outwardly facingannular shoulder 34: intermediate its ends. When so constructed the part35 of the cylinderabove the shoulder serves as a power chamber and thepart 36 of the cylinder below the shoulder serves as a pump chamber. Thepistons 25, 26, .27 and 2-8 are ,each of a form complementary to that ofthe cylinder within which they respectively 0pcrate. Each pistonaccordingly has a smaller upper portion 37 and a larger base portion 38.the two portions 37 and 38 be ing located upon opposite sides of anannular shoulder 39.

The explosive charge is most desirably supplied downwardly through thecover plate 22 of the water jacket, as from a pair of nipples one ofwhich is shown at 40. Each of these nipples leads from the usualmanifold (not shown) and is secured to the. cover plate 22 by bolts $1..Ducts, as. 42 and cover plate 22,- is

43, lead downwardly within the chamber of the water jacket 14 from thenip le 40 to the pump, chamber portions 36 0 the two adjacent cylinders,as 10, 11 or 12, 13. Preferably each 'ofthese ducts leads into thecorres pending-rpump chamber. 36, through a t, irs D 44, located uponthe annular shower 34 of the c linder wall. Most desira ymdownward yopening check valve is located in each of the ducts 42, 43. In orderthat this check valve may be adjacent the port 44 and still be readilymovable at the top of the engine upon removal of the it is carried by asleeve 46 which fits within the duct. This sleeve rests upon an annularshoulder 47 formed in the Wall of the duct, as 42- (Fig. 7). The coverplate 22 engages the higher end of the sleeve to prevent itsdisplacement. l

I Transfer passages, as 48,49, extendbe tween the larger bore 36 of eachcylinder and the smaller bore '35 of the. other cylinder of the same.pair'. Most desirably these transfer passagesliko the ducts 42, 43 arecored into parts of the integral casting from which the cylinder wallsand the side walls of the water jacket 14ers produced.

- 5 shown, the portebpenings, as 50, 51, at

the; opposite ends oil the ducts 48, 49, are

located upon the annular shoulder 34- of one cylinder and upon the sidewall of the smaller 'portiq 35 of the adjacent'cylinder respectively. ythis means the explosive charge drawn from the duct 42 or 43 upon thedownward movement of the piston is transferred to the smaller portion 35of an adjacent cylinder upon the upward movement of the piston. Toprevent too high a pressure being exerted at the port 51, an independentintermediate chamber communicating with each of the transfer passages,as 48, 49, is preferably provided. Two of these independent intermediatechambers are shown in the drawing at 52 and-53. They are convenientlyformed by coring out a part of the common wall between the two adjacentcylinders, as 12, 13 above the transfer passages 48, 49, with which theyrespectively communicate.

'A check valve, as 54, is preferably provided in each of the transferpassages 48, 49, below the corresponding intermediate chamber 52 or 53.As showneach of the check valves is constructed to be removed throughthe top of the corresponding intermediate chamber 52, 53 when the coverplate 22 of the water jacket 14, has been removed. To this end, the topof each of the intermediate chambers 52, 53 is preferably closed tion ofeach of thecheck valves 54, is more so and by a screw cap 55 (Fig. 6).The construc-' renapvably connected as by a screw threaded engagementbetween the periphery of the cap 57 and the rimof the cup shaped baseportion 56. The floor of the base portion 56 is provided with aplurality of aperturesfrom its seat upon the removal of the top plate 22and closure 55, the cap 57 is preferably'prcvided Wltllfin u wardlyextending central stem 61. The higher end of this stem is of reduceddiameter and has sliding engagement with the closure plate 55. A

spring 62 coiled about the upper end of the stem 61 and reacting betweenthe under side of the closureplate 55 and the annular shoulder 63 uponthe stem, serves for yieldingly holding the check valve 54 against itsseat upon the shoulder 60. Preferably the sprin 62 will be of suchstrength as to pre vent valve except in the event of an explosion of gasin the corresponding pump chamber 36.

The several cylinders as 10, 11, 12 and 13; ofthe engine have exhaustports, as 64, 10-" cated upon the side walls of the cylinder in: themanner usually employed in the case of two-cycle gas engines. Ducts, as65, 66 and 67 communicate with the several exhaust ports 64 to deliverthe products of combus tion through. the side wall of the water jacket14. Preferably the walls of these ducts are formed integral with thewalls of the cylinders and the side wall of the water jacket. The ducts65 and 67 communicate with the exhaust port 64 of the cylinders 10 and13, respectively. The duct 66 extends outwardly from between thecylinders '11 and 12 and communicates with the exhaust ports 64 of bothof these cylinders.

By making the several parts of the engine in about the proportionsshowmin the drawings, the volume of each pump chamber 36 is greater thanthe volume of the combustion chamber 35 to which it delivers.

' By forming the intake ports 44 and outlet ports 50 upon the annularshoulder 34 and by locating the check valves 45 and 54 adja-. cent'these' ports, respectively, a complete new charge of gas is drawn intoeach of the pump chambers 36 at each downward stroke of thecorresponding piston andall of this gas is expelled from, such pumpchamber at the next up stroke of the piston. By these displacement ofthe casing of the check.

7 completely surrounded with hot Water contained this jacket, there willbe no condensation of the vapors in these chambers such as usuallyoccurs when a part of the es plosivecharge is temporarily retained in anintermed ate chamber.

I claim as my invention- 1. In a gas engine, in combination, ii-pair ofcylinders each having a bore of two diameters, pistons operating inylinders in alternation, each piston having an unperforate surfacecomplementary in form to the bore of the corresponding cylinder, aninduction port at the inner end of the larger bore of each cylinder, apair or? independent transfer passages extending between the cylinders,the port openings at the opposite ends of each of said transfer passagesbeing at the inner end of the larger-bore of one cylinder and at theouter end of the smaller bore of the other cylinder, respectively, and acheck valve in each of the said transfer passe 2. gas engine, incombination, a pair of cylinders each having a bore of two diameters,pistons operating in said cylinders in alternation, each piston havingan imperiora-te surface complementary in form to the bore of thecorresponding cylinder, an induction port at the inner end of the largerbore of each cylinder, a checkvalve controlling cachof said inductionports, a pair of independent transfer passages extending betweenthe-cylinders, the port openings at the "opposite ends of each of saidtransfer pa'ssages being at the inner endof the larger bore of onecylinder and at the outer end of the smaller bore of the other cylinder,re-

the other cylinder, respectively, and a, check valve in each or the saidtransfer passages.

l. in a gas engine, in combination, E

power cylinder, a Water jacket surrounding the cylinder, a removablecover plate nor mally closing the top of thqvater jacket, an inductionpassage extending through the water jacket and its cover plate andopening at its lower end into the cylinder and having an instandingshoulder in its well adjacent its lower end, a removable bushing fittingthe said induction passage and extending between the said shoulder andthe under side of the said cover plate. and a check valve mounted at thelower end of the bushing and removable therewith upon eniovel oi thecover plate of the Water in combination, a pair of cylinders, the boreof each cylinder having an outwardly shoulder interits ends, pistereciprocating alternation one in each cylinder, each piston having animperforate surface complementary in form to the bore of thecorresponding cylinder, the piston displacement in the larger bore ofeach cylinder being greater than the piston displacement in the smallerbore of the other cylinder. an induction port located upon the saidannular shoulder of each cylinder, a check valve controlling each of thesaid induction ports. a pair of transfer passages extending between thecylinders. the port openings at the opposite ends of each of saidtransfer passages being upon thesaid annular shoulder of one cylinderand at the outer end of the smaller bore of the other cylinder.respectively, and

a check valve in each of he said transfer passages.

6. In a gas engine, in combination, a com'-; bustion chamber, acompression chamber, an intermediate chamber communicating with "both ofthe first mentioned chambers but spoctively, and a check valve in eachof the slid transfer passages.

i 3, In a gas engine, in combination, a pair of cylinders, the bore ofeach cylinder having an -outwardly facing annular shoulder intermeiliateits ends, pistons reciprocating 'in alternation one in each cylinder,each piston having an imperforate surface complementary in form t-o'thebore of the corre sponding cylinders, an induction port lo cated uponthe said annular shoulder of each cylinder, :1 check valve controllingthe said induction port, apair of independent trans fer passagesextending between the cylinders, this port openings at the opposlteenkls having no-other opening, a check valve be tweenthe compressionchamber and the intermediate chamber, an explosive charge inductionpassage leading to the compression chamber and plungers Working in thecoin bustion chamberand compression chamber in alternation.

7. In a gas engine, in combination, a pair of combustion chambers, apair of compression chambers, independent intermediate chambercommunicating with. eachfot the compression chambers and one of the cornbust-ion chambers out having no other opening, a check valve locatedbetween each compression chamber and the corresponding intermediatechamber, an explosive charge in duction passage leading to eachcompression chamber, and plungere working in the a. i g

I compression and combustion chambers of each pair in alternation.

8. In a gas engine, in combination, a com-v bustion chamber, anintermediate chamber, a water jacket surrounding both of said chambers,a compression chamber, an induction passage leading through the waterjacket to the compression chamber, a check valve between the compressionchamber and the intermediate chamber, and plungers working in thecombustion chamber and the compression chamber inalternation. Y

9. In a gas engine, in combination, a combustion chamber, anintermediate chamber,

a water jacket surrounding both of said chambers, a compression chamber,an induction passage leading through the water jacket to the compressionchamber, a check valve controlling the opening of the induction passageinto the compression chamber,

a check valve between the compression chamber and the intermediatechamber, and plungers working in the combustion chamber and thecompression chamber in alternation. 7 I

10. In a gas engine in combination, a pair of cylinders, the bore ofeach cylinder having an outwardly facing annular shoulder intermediateits ends, pistons reciprocating in alternation one in each cylinder,each pis- 4 ton having an imperforate surface complementary in form tothe bore of the corresponding cylinder, an induction port located uponthe said annular shoulder ofeach cylinder, a check valve controllingeachof the said induction ports, a pair of transfer passages extendingbetween the cylinders. the

port openings at the opposite ends of'each of said transfer passagesbeing upon the said annular shoulder of one cylinder and at the outerend of the smaller bore of the other cylinder, respectively, a checkvalve in each of the transfer passages, and an independent intermediatechamber communieating with each of the transfer passages between thecheck valve and the port open ing of such transfer passage into thesmaller bore of the corresponding cylinder.

11. In a gas engine, in combination, a combustion chamber, a waterjacket therefor, an intermediate chamber located within the chamber ofthe said water jacket, a comression chamber, an explosive chargeinduction passage leading to thecompression chamber, a check valvebetween the comprcssion chamber and the intermediate chamber andplungers working in the com-- bustion chamber and the compressionchamber in alternation.

12. In a gas engine, in combination, a combustion chamber, a waterjacket therefor, an intermediate chamber located within the chamber ofthe said water jacket, a compression chamber, an explosive chargeinduction passage leading, to the compression chamber, a checkvalvebetween the compression chamber and'the intermediate chamber, andplungers working in the comgustion chamber and the compression chamer. a

13. In a gas engine, in combination, a combustion chamber, a waterjacket there for, an intermediate chamber having a common wall with thesaid water jacket, a com valve between the compression chamber and theintermediate chamber and plungers working. in the combustionchamber andthe compression chamber in alternation.

15. In a gas engine,,in combination, a pair of cylinders each having abore of two diameters, pistons operating in said cylinders inalternation, each piston having an imperforate surface complementary 1nform to the bore of the corresponding cylinder, an induction port at theinner end of the larger bore of each cylinder,'a pair of independentintermediate chambers each having two port openings which are located,respectively, at the inner end of the larger bore of one cylinder and atthe outer end of the'smaller bore of. the other cylinder, and a checkvalve controlling vthat one of the port openings of each of the saidintermediate chambers which is located at the inner endof the largerbore of acylinder.

' 16.- In a vgas engine, in combination, a pair of cylinders each havinga bore of two diameters, pistons operating in ,said cylinders inalternation, each -pmton havin an imperforate surface complementary in:orm to the bore of the corresponding cylinder, an induction ort at theinner end of the larger bore 0 eachcylinder,a checkvalve controllingeach of said induction ports, a pair of independent intermediatechamberseach-havingtw'o port openings which are located,respectively,at theinner-end of wall with the said water jacket, a check the larger'bore'ofon'ei cylinjde'r and *at the in ages engine, pair,

aieaoaa of cylinders, the bore of each cylinder having an outwardlyfacing annular shoulder intermediate its ends, pistons reciprocating inalternation one in each cylinder, each piston having an iinperforatesurface coinpleinentary in form to the bore of the correspondingcylinder, an induction port located upon the said annular shoulder ofeach cylinder. check valve controlling the said induction port, and apair o1 independent intermediate chambers each having two port openings,which are located, respectively, upon the said annular shoulder of onecylinder and at the outer end of the smaller bore of the other cylinder,and a check ialve controlling that one of the port openings of each ofthe said intermediate chambers which is located upon the said annularshoulder of a cylinder.

18. In a gas engine, in combination, a power cylinder, a pumpingcylinder, a chambered casing, passages connecting the chamber of thecasing with both of said 19. In a gas engine, in combination, a

pair of upright cylinders each having a bore of two diameters, pistonsoperating in said cylinders in alternation, each piston beingcomplementary in form to the bore of the corresponding cylinder, a pairof upright tubular casings located between the cylinders, a portconnecting the larger bore e bore feet, a y l e co i cr's, a portconnect 03231119 above the come spending one of the said valves with thesmaller bore oi the cylinder other than the one having its larger boreconnected with the bore oi the same casing by one 03'? the first namedports, and a cap reniovably fitting the top of each casing, each of thesaid valves being removable through the top of the corresponding casingupon removal of the corresponding cap.

20-, In a gas engine} in combination, a pair of: upright cylinders eachhaving a bore of two diameters, pistons operating in said cylinders inalternation, each piston being complementary in form to the here or thecorresponding cylinder, a pair of upright tubular casings located beteen the cylin ders, a port connecting the larger bore of each cylinderWith the bore of one of said tubular casings at its root, a valvecontrolling each of said ports, port connecting the bore of each casingabove the corresponding one of ihe said valves with the smaller bore ofthe cylinder other than the one having its larger bore connected withthe bore of the same casing by one of the first named ports, a waterjacket surrounding the said cylinders and casings, a I'EIHQV'. ablecover plate normally closing the top of the Water jacket, and/a capdetachably fit ting the top of each of the said casings be low the saidcover plate, each or the said valves being removable through the top ofthe corresponding casing and top of the Water jacket upon removal or thesaid cover plate and corresponding cap,

GLEVER M. DE

Witnesses:

Cries. B. Gwen, E. M. liners/nan.

LAUNT Y.

